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Structure of IS1549 insertion site in mutants. Kanamycin-resistant mutants 2K to 25K were formed by the insertion of IS1549 within the end of IS6110 or the sequence flanking IS6110. The map for each mutant shows the portion of the aph gene and IS6110 sequence which was duplicated to form the long, variable-length direct repeats; the arrows beneath each map indicate the lengths of the direct repeats.
